It took a 1 minute Ramp delay at IAD (for positive bag match). The divert reason is MX.

It's a maintenance diversion. Shows on status in IAH because "excess cab alt on upper ECAM". Also looks like the crew used all available O2 bottles. I'm not too familiar with the ECAM, I know it's like Boeing's EICAS, but I reckon by the diversion that it's a no go item. UA is ferrying in Mechanics from DEN for the repair

It's a maintenance diversion. Shows on status in IAH because "excess cab alt on upper ECAM". Also looks like the crew used all available O2 bottles. I'm not too familiar with the ECAM, I know it's like Boeing's EICAS, but I reckon by the diversion that it's a no go item. UA is ferrying in Mechanics from DEN for the repair

Thanks for the info, right now UAL823D from IAH to MEX is en route, and United 822 heading back to IAD is set to go at 16:30.